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how do I create a routing table (AIX)

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Operating Systems AIX how do I create a routing table (AIX)
# 1  
Old 01-26-2009
how do I create a routing table (AIX)
Hi,

I just noticed that we cannot connect to some parts of our network. I guess this has something to do with a network change some time ago where we got different subnets.

We have our workstations all connected to a switch with a subnet 10.100.123.xx The switch is then connected to our main host computer (AIX 4.3.2) with IP address 10.100.123.254

Also in the host is a NIC with IP 10.100.121.99 connected to a BNC tokenring with several stations within the subnet 10.100.121.xx

From our work stations we currently cannot connect to the 10.100.121.xx computers.

How can I fix this? How does IP routing work?

Thanks for any input!
Robbert
# 2  
Old 01-27-2009
This is my routing table which I got from netstat -rn

How do I read this? What entry must I create (and how) to connect the 10.100.123.x with the 10.100.121.x networks?


Code:
Routing tables
Destination      Gateway           Flags   Refs     Use  If   PMTU  Exp  Groups

Route tree for Protocol Family 2 (Internet):
default          10.100.121.254    UG        0     2921  en3     -   -  
10/8             10.100.122.99     U         0       88  et4     -   -  
10.100.119/24    10.100.119.1      U        48 70480762  en5     -   -  
10.100.120/24    10.100.121.1      UG        0       28  en3     -   -  
10.100.121/24    10.100.121.99     U        43  6738619  en3     -   -  
10.100.122/24    10.100.122.99     U         0      758  en4     -   -  
10.100.123/24    10.100.123.254    U        17 453802793 en16     -   -  
10.100.127/24    10.100.121.1      UG        0        7  en3     -   -  
10.100.129/24    10.100.121.2      UG        0        3  en3     -   -  
10.100.130/24    10.100.121.7      UG        0     1704  en3     -   -  
127/8            127.0.0.1         U         6     1190  lo0     -   -  
192.3.3.1        192.3.3.2         UH        0        0 sl17     -   -  

Route tree for Protocol Family 24 (Internet v6):
::1              ::1               UH        0        0  lo0 16896   -

# 3  
Old 01-27-2009
You'll need to turn on ip forwarding and configure the AIX machine as a gateway for this to work.

Start here:
pSeries and AIX Information Center
# 4  
Old 01-28-2009
Thanks, will have a look at it!
# 5  
Old 01-29-2009
Your first post sounded (if i got the wrong impression: sorry) as if you were not all too knowledgeable about how IP routing works at all. If so, a book about networking basics might help to understand the underlying concepts. The book i found most exhaustive as well as well-written was W. Richard Stevens "TCP/IP Illustrated", which comes in three volumes. He covers, from the basics up to a reference implementation of a network-stack written in C, every aspect of TCP/IP-networking there is.

I hope this helps.

bakunin
# 6  
Old 01-29-2009
@bakunin
Thanks for the tip! I am a bit unknown about the routing part. Though I understand the concept, I have never had to setup a routing table myself. So in that way I am a complete noob.

I have also found a nice tutorial (in Dutch)on the web explaining the basics of setting up a routing table. But as it does not cover all the aspects, I'm already stuck again. I might give your book tip a try, if I can get my hands on it :-)

Thanks again (everyone) for all the replies!

Robbert
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